Sectional mold



'P. A. MOLUF SEG'IIONAL MOLD Filed Dec 18, 1936 May 25, 1937;

Patented May 25, 1937 I UNiTE TATES ATENT Paxton-Mitchell ComApplication December 18,

Da y, Omaha, Nebr.

1936, Serial No. 116,617

'5 Claims. 01. 23-200) The present invention relates to improvements indry sand molds and to a new method of preparing such molds for castingcylinders and like objects. .7

One of the primary objects of my invention is theprovision of asectional mold so constructed and arranged as to enable the use ofrelatively short cylinder patterns of the proper diameter for producingany desired length of cylinder casting, thus eliminating the necessityof providing a separate pattern for each length cylinder casting thatmay be required.

A further object in view is to provide means in the molds of this typefor entrapping any loose sand or slag preliminary to the flowing of themolten metal into the mold cavity proper to prevent formations ofimperfections in the castmg.

A still further objective resides in'the provision of means in amulti-section mold for regulating the length of the casting, whereby thesimple process of merely adding a particular section-one having anoverflow gate-elfectively controls the overall length of the casting.

Other and further objects and advantages of the invention will behereinafter set forth and the novel features thereof defined by theappended claims.

In the drawing:

Fig. l is a top plan View of a mold constructed in accordance with myinvention; and

Fig. 2 is a vertical sectional View on the line 2-2 of Fig. 1.

Like reference characters designate corresponding parts in the severalfigures of the drawmg.

Referring to the drawing, l designates the drag or base section which ismounted upon the base plate 2. In this base section the sand 3 iscompacted in the usual manner and so as to form a pocket or enlargedcavity 4 and a vertical passage 5 disposed to communicate with the moldcavity proper as hereinafter set forth. The passage 5 is formed with aconstricted neck 6 which functions in an important manner in the methodof pouring, as will be later explained.

Upon the base section is positioned any desired number of correspondingcheek sections 1 and 8 together with the cope section 9. Each of thesesections is composed of a conventional flask in which the outer moldwall IU of sand is contained and, in proper spaced relation, the core Il forming the inner sand Wall, thus providing the mold cavity proper l2.

The core of each section is also formed with a 'ber within the confinesof pouring sprue l3 which is aligned with the mouth of the cavityor'pocket 4. Similarly each core section is also provided with arelatively large chamber l4 bottomed by the sand 3 of the base sectionwhen the mold is assembled to thereby 5 form which I call an overflow orsurplus chamthe core.

"Each of sections 7, 8 and 9 is thus correspondingly constructed except.as regards the top section which has, in addition, a transverse gate I5in the core constituting an overflow or gauging passage, establishingcommunication between the mold cavity proper and the surplus chamberbefore mentioned.

It is obvious from the foregoing that the disposition of the sectionwith the overflow l5 controls the length of the cylinder in anyarrangement of the superposed sections and hence it should be placedpreferably at the top sections of any mold combination.

It should be added that each flask section is provided with an internal,annular flange !6 which helps support the outer sand wall l0 and withthe usual aligning pins I! to engage cooperative aperture ears It. Inthe assembly of the mold apparatus, each flask section with its moldsand is disposed in its proper position, one upon the other. The coresections H are properly disposed in spaced relation to the outer wallsections l0 and held in such position by means of the long clampingbolts l9 and the cross bars v2|], pressure blocks 20a being positionedbetween said bars 20 and the top core section II.

In following my method of casting, the molten metal is poured into thesprue I3 aligned with the pocket 4 into which it passes. Any loose sandor slag, being lighter than the metal, will be trapped in this pocketwhile the metal will pass throughvthe choked neck 6 and into the moldcavity proper l2. The pouring of the metal is continued until it flowsover into the chamber l4, through gate I5, the overflow carrying with itthe froth, dross, and other impurities which pass the entrance cavity.

A casting of high quality and proper length will thus result and sinceeach of the mold sections may be formed by a relatively short pattern ofproper diameter and such sections superimposed in sufiicient numbers toform the whole, a very economical method of casting different cylinderlengths is thus devised.

While the specific details of construction have been herein shown anddescribed, the invention is not confined thereto as alterations m y be

